Stearic acid is a type of saturated fatty acid with an 18-carbon chain that has a lower cholesterol content than other saturated fatty acids. Therefore, stearic acid is less harmful to human health than other saturated fatty acids. Stearic acid is obtained by adding acid to animal fat with water at high pressure and temperature, which leads to the hydrolysis of triglycerides. Stearic acid can also be produced by hydrogenating some unsaturated vegetable oils. Typically, stearic acid is actually a mixture of stearic acid and palmitic acid, although pure stearic acid is also available.
Technical Characteristics
| Chemical Formula | C18H36O2 |
| Other names | Octadecanoic acid C 18:0 |
| CAS Number | 57-11-4 |
| Molecular mass | 284.484 g·mol−1 |
| Density | 0.9408 g/cm3 (20 °C) |
| Melting Point | 69.3 °C |
| Boiling Point | 361 ℃ decomposes |
| Appearance | White solid |
Applications
– Food industry
– Cosmetics and hygiene products production
– Pharmaceutical industry
– Rubber industry
– Lubricant production
– Agricultural industry
– Textile industry
Environmental impact of Stearic Acid
Stearic acid, when released into the environment, can contribute to water pollution. It can form a thin film on the surface of water, potentially affecting aquatic life by blocking oxygen transfer and harming aquatic organisms. Additionally, stearic acid can accumulate in soils, leading to long-term environmental contamination if not properly disposed of. However, since it is biodegradable, its environmental impact is generally lower compared to other more persistent chemicals, though proper management is still required.
Safety Measures and Regulations for Handling Stearic Acid
When handling stearic acid, it is important to use personal protective equipment (PPE) such as gloves, goggles, and protective clothing to avoid skin and eye contact. Although stearic acid is relatively safe, it can cause irritation on prolonged contact. It should be stored in a cool, dry place, away from heat and incompatible materials. In the event of a spill, the area should be cleaned immediately with an appropriate absorbent material. Handling should be done in well-ventilated areas to minimize inhalation of dust. Compliance with local safety and disposal regulations is essential.
Packing
Stearic acid is supplied in carton/25 kg woven plastic bags.